ns16550_t: remove unused bus_t member

riscv/devices.h

@@ -127,14 +127,13 @@ class plic_t : public abstract_device_t, public abstract_interrupt_controller_t
 
 class ns16550_t : public abstract_device_t {
  public:
-  ns16550_t(class bus_t *bus, abstract_interrupt_controller_t *intctrl,
+  ns16550_t(abstract_interrupt_controller_t *intctrl,
             uint32_t interrupt_id, uint32_t reg_shift, uint32_t reg_io_width);
   bool load(reg_t addr, size_t len, uint8_t* bytes) override;
   bool store(reg_t addr, size_t len, const uint8_t* bytes) override;
   void tick(reg_t rtc_ticks) override;
   size_t size() { return NS16550_SIZE; }
  private:
-  class bus_t *bus;
   abstract_interrupt_controller_t *intctrl;
   uint32_t interrupt_id;
   uint32_t reg_shift;

riscv/ns16550.cc

@@ -69,9 +69,9 @@
 
 #define UART_SCR                7 /* I/O: Scratch Register */
 
-ns16550_t::ns16550_t(class bus_t *bus, abstract_interrupt_controller_t *intctrl,
+ns16550_t::ns16550_t(abstract_interrupt_controller_t *intctrl,
                      uint32_t interrupt_id, uint32_t reg_shift, uint32_t reg_io_width)
-  : bus(bus), intctrl(intctrl), interrupt_id(interrupt_id), reg_shift(reg_shift), reg_io_width(reg_io_width), backoff_counter(0)
+  : intctrl(intctrl), interrupt_id(interrupt_id), reg_shift(reg_shift), reg_io_width(reg_io_width), backoff_counter(0)
 {
   ier = 0;
   iir = UART_IIR_NO_INT;

riscv/sim.cc

@@ -146,7 +146,7 @@ sim_t::sim_t(const cfg_t *cfg, bool halted,
   if (fdt_parse_ns16550(fdt, &ns16550_base,
                         &ns16550_shift, &ns16550_io_width, "ns16550a") == 0) {
     assert(intctrl);
-    std::shared_ptr<ns16550_t> ns16550(new ns16550_t(&bus, intctrl, NS16550_INTERRUPT_ID,
+    std::shared_ptr<ns16550_t> ns16550(new ns16550_t(intctrl, NS16550_INTERRUPT_ID,
                                                      ns16550_shift, ns16550_io_width));
     bus.add_device(ns16550_base, ns16550.get());
     devices.push_back(ns16550);